netdev - Re: [PATCHv2] tcp: fix crash in tcp_xmit_retransmit

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Message-Id: <20100719.125500.257479409.davem@davemloft.net>
Date:	Mon, 19 Jul 2010 12:55:00 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	eric.dumazet@...il.com
Cc:	ilpo.jarvinen@...sinki.fi, lennart.schulte@...s.rwth-aachen.de,
	tj@...nel.org, linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org, henning.fehrmann@....mpg.de,
	carsten.aulbert@....mpg.de
Subject: Re: [PATCHv2] tcp: fix crash in tcp_xmit_retransmit_queue

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Mon, 19 Jul 2010 19:39:08 +0200

> Do you know in what exact circumstance the bug triggers ?
> 
> It's hard to believe thousand of machines on the Internet never hit
> it :(
> 
> Maybe another problem in congestion control ?

This is something to investigate, but the conditions under which
tcp_fastretrans_alert() (the main invoker of tcp_xmit_retransmit_queue())
does it's thing are complicated enough that I'm going to add this fix
for the time being and push it out to stable too.

Thanks everyone.
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